公开(公告)号：US20250023575A1

公开(公告)日：2025-01-16

申请号：US18524652

申请日：2023-11-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Rishi SOUNDARARAJAN ,  Visvesvaraya Appala PENTAKOTA ,  Sai Vikas KANDIMALLA ,  Neeraj SHRIVASTAVA ,  Eeshan MIGLANI

IPC: H03M1/10

Abstract: An analog-to-digital converter (ADC) includes: a time-domain ADC core; and a calibration circuit. The time-domain ADC core includes: a first delay-to-digital stage having a terminal; a second delay-to-digital stage having a terminal; a third delay-to-digital stage having a terminal. The calibration circuitry is coupled to the terminal of the first delay-to-digital stage, the terminal of the second delay-to-digital stage, and the terminal of the third delay-to-digital stage of stages. The calibration circuitry is configured to calibrate the first delay-to-digital stage, the second delay-to-digital stage, and the third delay-to-digital stage based on a zero-crossing calibration and an over-range calibration. The over-range calibration sets a maximum threshold and a minimum threshold for the time-domain ADC relative to a reference voltage.